Organosilicon compounds

ABSTRACT

D R A W I N G

United States Patent Inventors Appl. No. Filed Patented Assignee Priority William J. Owen Penarth;

.Bryan E. Cooper, Bridgend, both or Wales 27,104 Apr. 9, 1970 Dec. 14, 1971 Midland Silicones Limited Berkshire, England Apr. 11, 1969 Great Britain ORGANOSILICON COMPOUNDS 7 4 Claims, No Drawings u.s. Cl 260/448,;151, mac/448.8 R, 260/457 R 1111.01 c07r7/02, 'C07f 7 04 Field or Search 260 4482 N, 448.8 R

[5 6] References Cited UNITED STATES PATENTS 3,172,874 3/1965 Klebe 260/4482 N 3,311,651 3/1967 Niederprum etal 260/4481 N Primary Examiner- Delbert E. Gantz,

Assistant Examiner-Werten F. W. Bellamy Attorneys-Robert F. Fleming, Jr., Laurence R. Hobey and Howard W. Hermann ABSTRACT: Organosilicon compounds defined by the formula ORGANOSILICON COMPOUNDS Thisinvention relates to novel Organosilicon compounds and to a process for their preparation,

According to the invention, there are provided organosil icon compounds of the general formula I l Rasiorrimmgggzsirm selectedfrom alkyl radicals, for example, methyl, ethyl,

propyl, decyl and octadecyl radicals, alkenyl radicals, for example, vinyl and allyl radicals, alkoxy radicals, for example,

methoxy, ethoxy, butoxy .and hexoxy radicals and aryl radicals, for example, phenyl, diphenyl and naphthyl radicals. The

' R substituents, which can be the same or differenuare selected from hydrogen atoms, alkyl radicals, and R -siCH groups, in which R is as defined above. When R represents an alkyl radical or the R SiCH groups, not more than one R attached .to anysilicon atom in the 'molecule can contain more than four carbon atoms.

' electron'ac ceptors, for example, they form a transient deep 1 blue color when added to methanol containing oxygen. The compounds of this invention are thus useful for the detection of oxygen. I r

The following examples'in which Me represents the methyl radical illustrate the invention.

EXAMPLE 1 Chloromethyltrimethylsilane (30.6 g., 0.25 mole), p-phen ylenediamine (5.4 g., 0.05 mole) and triethylamine (40 ml.) were mixed and heated in an autoclave at 150' C. for 48 hours/The autoclave was then allowed to cool and the reaction mixture recovered and washed under nitrogen with cold aqueous KOH solution. The product was then extracted with diethyl ether and the dried ether fractionated to give The compounds of this invention can therefore contain two three or four R SiCl-l groups attached through two nitrogen atoms to a phenylene or diphenylene residue. They, can be prepared by a novel process involving the reaction of a phenylene diamine or a diphenylene diaminev with a halornet hyl substituted Organosilicon compdund. Also included within the. scope of this invention, therefore, is a process for the p'reparation of the compounds .of the invention which comprises reacting together (.1) a 'silane of the general formula R SiC H X, wherein X is Cl, Br or land R is as hereinbefore defined with (2) a com pound of the general formula HR"NArN R"H,'

wherein Ar represents the phenylene or diphenylene radical and each R represents a hydrogen atom or an alkyl radical,

' not more than one R radical in (1)"having more than four carbon atoms when R ln'(2)lS 'an alkyl radical.

- 'When cool, the reaction mixture was washed under nitrogen with cold aqueous KOH solution, extracted with ether and the in order to obtain'maximurn yield of the desired product,

. the process of this invention is preferably carried out in the presence of an acceptor for the liberated hydrogen halide and employing a stoichiometric excess of the halomethylsilane 1). Any hydrogen halide acceptor can be employed for this purpose provided it is not reactive with the silane, the preferred ones being pyridine, triethylamine and trimethylamine. If desired, solvents, preferably polar solvents such as the high boiling ethers, can be included in the reaction mixture to facilitate the reaction. Conveniently, however, the I hydrogen halide acceptor is chosen such that it is also a solvent for the reactants. v 1

Normally, the application of heat is desirable tofacilitate the reaction with r'e'action temperatures of from about 75f to 4 175 C. being appropriate in most instances. The reaction'ca'n be carried forward at atmospheric, subatmospheric or superatmospheric pressures, the latter being employed when the boiling point of one {or more'of the reactants is below the I desired reaction temperature. Isolation ofthe product from the reaction mixture can be achieved by conventional means, for example, by extraction with a suitable'solvent and fractional distillation.

The compounds of this invention have been found to have oxidation potentials which are lower than those of aromatic diamines and they are, therefore, useful as additives to organic rubbers and other polymers to stabilize such materials against degradation by oxygen or ozone. They also have the property of forming highly colored charge transfer complexes with (15 g., 67%) as a pale yellow liquid l60/0.5 mm. Elemental analysis gave C, 58.9; H, 10.3; N, 6.8%. c H N Si, requires C, 58.4; H, ,10.6; N, 6.2%. The infrared and nuclear magnetic resonance spectra were both consistent with the proposed structure.

3p.l of the compound was dissolved vin 50 ml. of deoxygenated methyl alcohol. The solution as prepared was colorless and was allowed to-stand'open to the atmosphere for 10 minutes. During this time, the solution assumed a deep blue color. After a further 30 minutespth e blue color had changed to pale red. e 1

EXAMPLE 2 Chloromethyltrimethylsilane (20.5 g., 0.2 mole) and p phenylenediamine (10.8 g.', 0.1 mole) and triethylamine (30 ml.) were heated in an autoclave at C. for 24 hours.

dried extract fractionally distilled to give a pale yellow solid,

(3.2 g., 11%) b.p. l38/l.5 mm. Found by elemental analysis C, 60.5; H, 9.9; N, 9.7%. C H N Si requires C, 60.0; H, 10.0;N, 10.0%. r

' EXAMPLE?! When example 1 was repeated employing 'in place of the chlorornethyl'trimethylsilane, a chemically equivalent amount of each of the following, the indicated products were obtained EXAMPLE4 7 When I example 2 was repeated employing a chemically equivalent amount of -P-diph enylenediamine, the product obtained was That which is claimed is: 1. Organosilicon compounds of the general formula 3,627,800 3 4 wherein Ar represents the phenylene or diphenylene radical, in which Me represents the methyl radical. each R represents an alkyl, alkenyl. alkoxy or aryl radical, and Th mp n each R represents a hydrogen atom, an alkyl radical or a radical or R SiCH group not more than one radical at- 5 R SiCl-l group, with the provision that when R is an alkyl (MezSiCH2)NHNH(CHzSiMeu) tached to any silicon atom has more than four carbon atoms.

2. Organosilicon compounds as claimed in claim 1 wherein Ar represents the p-phenylene or p-diphenylene radicals.

3. The compound in which Me represents the methyl radical.

I I i i i 

2. Organosilicon compounds as claimed in claim 1 wherein Ar represents the p-phenylene or p-diphenylene radicals.
 3. The compound in which Me represents the methyl radical.
 4. The compound in which Me represents the methyl radical. 